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09-22-2013, 05:37 PM   #1
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Swapping out the plastic mount on a DA 35/2.4?

I've got a truly awful F 35-80 that I'm going to take apart so I can see how it's put together. Is transferring the mount to my 35 as simple as I think it is? Has anybody successfully attempted this? I searched the archives, but didn't find any threads that show results.

09-22-2013, 07:20 PM   #2
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This recent post indicates you might have trouble:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/236756-transpl...ml#post2506650

It might be something you can work around. The mounts are meant to do the same job, but a lot of manufacturing changes happen over 25 years.
09-22-2013, 09:20 PM   #3
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QuoteOriginally posted by Fat Albert Quote
I've got a truly awful F 35-80 that I'm going to take apart so I can see how it's put together. Is transferring the mount to my 35 as simple as I think it is? Has anybody successfully attempted this? I searched the archives, but didn't find any threads that show results.
I tried putting the mount from my F 35-105 onto a DA 35 2.4. It did not work. There was a plastic piece inside the ring that extended inward that prevented the mount from sitting cleanly on the DA 35 2.4.

That being said, someone with power tool skills could probably cut that piece off to make it fit. Or, if you have another F series mount, like from a prime lens, that might work off the bat.

Anyways, taking the mounts off is pretty simple. Just put a piece of tape over the contacts so that the contact pins don't spring away into your carpet and be lost forever.
09-22-2013, 11:44 PM   #4
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Get the right part

Or you could call pentax at their 800-877-0155 number to get the right part that is the right thickness so your lens will focus properly. Probably the part costs less then ten bucks and will be less headache. Rarely are such things interchangable.

09-23-2013, 07:02 AM   #5
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QuoteOriginally posted by pentaxus Quote
Or you could call pentax at their 800-877-0155 number to get the right part that is the right thickness so your lens will focus properly. Probably the part costs less then ten bucks and will be less headache. Rarely are such things interchangable.
If you read my OP, you'd know that my aim is not to replace the plastic mount--it's taking apart an old lens.
09-27-2013, 12:59 PM   #6
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QuoteOriginally posted by Fat Albert Quote
I've got a truly awful F 35-80 that I'm going to take apart so I can see how it's put together. Is transferring the mount to my 35 as simple as I think it is? Has anybody successfully attempted this? I searched the archives, but didn't find any threads that show results.
not sure that you can just take any Penatx lens mount and replace it - just looking at the part. Lenses require different amount of shimming etc, so there is more to it than simply replacing a single piece like a "mount". Many funny thing can happen and you may lose your 35 mm lens.
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